Am I right that 1970 was when it was all happening with changes in dial lettering on 751 movement c-cases?
1970 is 31000000 - 32999999, right? (contrary to some online ressources that attribute the 31 millions to 1969).
My own example has serial number 31936153 and has the "transition" type dial, i.e. with the old layout (Omega at the top, Constellation + star at the bottom), but the new font (straight final "n" in "Constellation" etc.). I've also seen 1970 numbered watches with the old font however, including (oddly) at least one that has a serial number higher than mine, in the 32 millions. But there were also c-cases with the 751 movement made in 1970 that had the full new style layout and font (Omega at the bottom, Constellation at the top, no star), before the transition to the 1000 series movements, right..?
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